keith ellis 2 Posted January 29, 2013 Share Posted January 29, 2013 hi. having just changed my old nicad's for new enloop batteries thought i would do a voltage check and have found that there is a .2 difference ie battery measures say 5.2 but when pluged in and checked through the built in charging socket is only 5.0 is this normal or is there something sinister going on. Quote Link to comment Share on other sites More sharing options...
Biggles' Elder Brother - Moderator Posted January 29, 2013 Share Posted January 29, 2013 If the model is turned on then the battery is under load - you would expect a small drop in voltage under such conditions. BEB Quote Link to comment Share on other sites More sharing options...
keith ellis 2 Posted January 29, 2013 Author Share Posted January 29, 2013 BEB. the lower voltage is when the battery is plugged into the loom and re checked through the charge socket. higher voltage is when checked on the battery plug only. this is all befor the rx. with no load but going through the harness switch only Quote Link to comment Share on other sites More sharing options...
Biggles' Elder Brother - Moderator Posted January 29, 2013 Share Posted January 29, 2013 Mmm?That's different. Something is loading it then that shouldn't be. Do you have a multi-meter and can check the resistance/continuity of the wiring harness/switch? BEB Quote Link to comment Share on other sites More sharing options...
keith ellis 2 Posted January 29, 2013 Author Share Posted January 29, 2013 The switch harness is around 7 years old so think ill just change it then if there should be no difference, just wasnt sure if the switch itself would have some resistance. but obviously not from what your saying Quote Link to comment Share on other sites More sharing options...
Biggles' Elder Brother - Moderator Posted January 29, 2013 Share Posted January 29, 2013 Well, it obviously will have some resistance they all do - but it should be very very small - and I can't see that it should be loading the battery like that with nothing else live. BEB Quote Link to comment Share on other sites More sharing options...
keith ellis 2 Posted January 29, 2013 Author Share Posted January 29, 2013 well now i am baffeled,, just out of interest i put the battery through a new unused switch harness and i still get a .1 volt drop. when going through the switch wondering if this was maybe a connection problem i tried it with 2 different batteries 1 is .1 different the other is .2 different,, ??? the plot thickens..... Quote Link to comment Share on other sites More sharing options...
Frank Skilbeck Posted January 29, 2013 Share Posted January 29, 2013 You might want to test the voltage before and after the switch with some load on it. Quote Link to comment Share on other sites More sharing options...
Peter Beeney Posted January 29, 2013 Share Posted January 29, 2013 Keith, - with respect, but may I ask what type of voltmeter you are using please? It might have a possible bearing on this. PB Edited By Peter Beeney on 29/01/2013 18:15:16 Quote Link to comment Share on other sites More sharing options...
keith ellis 2 Posted January 29, 2013 Author Share Posted January 29, 2013 the meter is a loaded meter, set at 1 amp loading, and found it to be accurate.in the past. i could use another normal meter but will need to make up a lead with a plug on it. Quote Link to comment Share on other sites More sharing options...
keith ellis 2 Posted January 29, 2013 Author Share Posted January 29, 2013 juct checked and its a Futaba br-2000 battery checker with a variable load of 1 - 3 amps Quote Link to comment Share on other sites More sharing options...
Peter Beeney Posted January 29, 2013 Share Posted January 29, 2013 Keith, - again with the greatest respect, but there is the answer, I’m afraid. Just Ohm’s Law. If you measured with a standard high impedance meter the difference would be much smaller, if any. If you want, there is a simple explanation. I imagine the switch harness is perfect. PB Quote Link to comment Share on other sites More sharing options...
keith ellis 2 Posted January 29, 2013 Author Share Posted January 29, 2013 PB, thankyou for the reasurance,, thats why i asked here first, knowing somone here would know the reasoning.. I will take your advise and check with my standard volt meter, I was more worried there might be a problem with the switch which could cause a failure, this just goes to show,, use the right tool for the job, many thanks for your assistance Quote Link to comment Share on other sites More sharing options...
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